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    quick question, my brother just changed spark plugs in his 2001 mustang. After changing spark plugs he had a problem. i test drove his car and it drove fine when not driven hard but if you put the car in a high gear at low speed and drive it out to redline to car seems to hesitate in stages. its a weird feeling. anyhow it finally gives full power like it should after going threw about 6 of these stages and only in the last 600 rpm. i checked the spark plugs and everything was fine. when i checked them i even indexed them. put everything back together and still the same problem. no codes. i only had about 15 minutes so i will check it out tomorrow but as of right now im kinda stumped. he did change from autolights to ngks. i think that might have somthing to do with it but i thought ngks worked well with the 4.6 soch. any advice
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